diff --git a/core/tests/Drupal/Tests/Core/Render/RendererTest.php b/core/tests/Drupal/Tests/Core/Render/RendererTest.php
index bed7d3d..f837539 100644
--- a/core/tests/Drupal/Tests/Core/Render/RendererTest.php
+++ b/core/tests/Drupal/Tests/Core/Render/RendererTest.php
@@ -87,6 +87,14 @@ public function providerTestRenderBasic() {
     $data[] = [[
       '#markup' => 'foo',
     ], 'foo'];
+    // Basic #markup based renderable array with value '0'.
+    $data[] = [[
+      '#markup' => '0',
+    ], '0'];
+    // Basic #markup based renderable array with value 0.
+    $data[] = [[
+      '#markup' => 0,
+    ], '0'];
     // Basic #plain_text based renderable array.
     $data[] = [[
       '#plain_text' => 'foo',
@@ -100,6 +108,14 @@ public function providerTestRenderBasic() {
     $data[] = [[
       '#plain_text' => Markup::create('<em>foo</em>'),
     ], '&lt;em&gt;foo&lt;/em&gt;'];
+    // #plain_text based renderable array with value '0'.
+    $data[] = [[
+      '#plain_text' => '0',
+    ], '0'];
+    // #plain_text based renderable array with value 0.
+    $data[] = [[
+      '#plain_text' => 0,
+    ], '0'];
     // Renderable child element.
     $data[] = [[
       'child' => ['#markup' => 'bar'],